2540. Minimum Common Value

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題目敘述

Given two integer arrays nums1 and nums2, sorted in non-decreasing order, return the minimum integer common to both arrays. If there is no common integer amongst nums1 and nums2, return -1.

Note that an integer is said to be common to nums1 and nums2 if both arrays have at least one occurrence of that integer.

Example 1

Input: nums1 = [1,2,3], nums2 = [2,4] Output: 2 Explanation: The smallest element common to both arrays is 2, so we return 2.

Example 2

Input: nums1 = [1,2,3,6], nums2 = [2,3,4,5] Output: 2 Explanation: There are two common elements in the array 2 and 3 out of which 2 is the smallest, so 2 is returned.

解題思路

Solution

import java.util.Arrays;

class Solution {
    public int getCommon(int[] nums1, int[] nums2) {
        Arrays.sort(nums1);
        Arrays.sort(nums2);

        for(int i = 0, j = 0; i < nums1.length && j < nums2.length; ) {
            if(nums1[i] == nums2[j]) {
                return nums1[i];
            } else if(nums1[i] < nums2[j]) {
                i++;
            } else {
                j++;
            }
        }

        return -1;
    }
}